4. Let L2(-π, π)) be the Lebesgue space of square integrable functions f: [-π, π] → C with inner-product, (f,g) =|...

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(4) Define «fg>-JfOgcdi (a) Now we show that the set Sel k EZ) is an orthonomal set sct-isin 27T 27T = cos 27T sin(k-k)t sin(

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